While the device is OFF, with boom in folder in position, push and hold down the button untill the light starts blinking. Then open the boom to turn the device on while having your 7520 "looking" for a new device. After the 7520 says it found the device, click your track wheel and put in 0000 (four zeros) and click your track wheel again. The Moto headset will rapid blink and you are done.